ISO 4996:2007
(Main)Hot-rolled steel sheet of high yield stress structural quality
Hot-rolled steel sheet of high yield stress structural quality
ISO 4996:2007 applies to hot-rolled steel sheet of high yield stress structural quality with the use of microalloying elements. The product is intended for structural purposes where particular mechanical properties are required. It is generally used in the delivered condition and is intended for structures that may include bolting, riveting and welding. ISO 4996:2007 does not cover steel intended for boilers or pressure vessels, steels designated as commercial quality or drawing quality (ISO 3573:1999), steels to be rerolled to cold-reducing products, steels designated as weathering steels, having increased atmospheric corrosion resistance, or steels having improved formability properties compared with those in ISO 4996:2007.
Tôles laminées à chaud en acier de construction à haute limite d'élasticité
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Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 4996
Fourth edition
2007-03-15
Hot-rolled steel sheet of high yield stress
structural quality
Tôles laminées à chaud en acier de construction à haute limite
d'élasticité
Reference number
ISO 4996:2007(E)
©
ISO 2007
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ISO 4996:2007(E)
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ii © ISO 2007 – All rights reserved
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ISO 4996:2007(E)
Contents Page
Foreword. iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 1
4 Conditions of manufacture . 2
5 Dimensional tolerances . 5
6 Tensile test sampling . 5
7 Tensile test . 5
8 Retests . 6
9 Resubmission . 6
10 Workmanship . 6
11 Inspection and acceptance. 6
12 Coil size . 7
13 Marking . 7
14 Information to be supplied by the purchaser . 7
Bibliography . 8
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ISO 4996:2007(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 4996 was prepared by Technical Committee ISO/TC 17, Steel, Subcommittee SC 12, Continuous mill flat
rolled products.
This fourth edition cancels and replaces the third edition (ISO 4996:1999), which has been technically revised.
iv © ISO 2007 – All rights reserved
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INTERNATIONAL STANDARD ISO 4996:2007(E)
Hot-rolled steel sheet of high yield stress structural quality
1 Scope
1.1 This International Standard applies to hot-rolled steel sheet of high yield stress structural quality with
the use of microalloying elements. The product is intended for structural purposes where particular
mechanical properties are required. It is generally used in the delivered condition and is intended for
structures that may include bolting, riveting and welding.
Because of the combination of higher strength and microalloy composition, it is possible to obtain savings in
mass, along with better formability and weldability as compared with steel sheet without microalloying
elements. The product is produced on a wide strip-mill, not a plate mill.
1.2 This product is commonly produced in thicknesses from 1,6 mm to 6 mm and widths of 600 mm and
over in coils and cut lengths.
1.3 Hot-rolled sheet less than 600 mm wide may be slit from wide sheet and considered as sheet.
NOTE Hot-rolled sheet, up to but not including 3 mm in thickness, is commonly known as “sheet”. Hot-rolled sheet
3 mm and over in thickness is commonly known as either “sheet” or “plate”.
1.4 This International Standard does not cover steel intended for boilers or pressure vessels, steels
designated as commercial quality or drawing quality (ISO 3573), steels to be rerolled to cold-reducing
products, steels designated as weathering steels, having increased atmospheric corrosion resistance, or
steels having improved formability properties compared with those in this International Standard.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 6892, Metallic materials — Tensile testing at ambient temperature
ISO 16160, Continuously hot-rolled steel sheet products — Dimensional and shape tolerances
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
microalloying elements
elements such as niobium, vanadium, titanium, etc. added singly or in combination to obtain higher strength
levels combined with better formability, weldability and toughness compared to non-alloyed steel produced to
equivalent strength levels
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ISO 4996:2007(E)
3.2
hot-rolled steel sheet
product obtained by rolling heated steel through a continuous-type or reversing-type wide strip-mill to the
required sheet thickness, the product having a surface covered with oxide or scale resulting from the
hot-rolling operation
3.3
hot-rolled descaled steel sheet
hot-rolled steel sheet from which oxide or scale has been removed, commonly by pickling in an acid solution
NOTE Descaling may also be performed by a mechanical means such as grit blasting. Some changes in properties
may result from descaling.
3.4 Edges
3.4.1
mill edge
normal edge without any definite contour produced in hot rolling
NOTE Mill edges may contain some irregularities such as cracked or torn edges or thin (feathered) edges.
3.4.2
sheared edge
normal edge obtained by shearing, slitting or trimming a mill edge product
NOTE Normal processing does not necessarily provide a definite positioning of the slitting burr.
3.5
aluminum killed
steel which has been deoxidized with aluminum sufficient to prevent the evolution of gas during solidification
4 Conditions of manufacture
4.1 Steelmaking
The processes used in making the steel and in manufacturing hot-rolled sheet are left to the discretion of the
manufacturer. On request, the purchaser shall be informed of the steelmaking process being used.
4.2 Chemical composition
The chemical composition (heat analysis) shall not exceed the values given in Tables 1 and 2.
4.3 Chemical analysis
4.3.1 Heat analysis
An analysis of each heat of steel shall be made by the manufacturer to determine compliance with the
requirements given in Tables 1 and 2. When requested, the heat analysis shall be reported to the purchaser
or the purchaser’s representative.
Each of the elements listed in Table 2 shall be included in the report of the heat analysis. When the amount of
copper, nickel, chromium or molybdenum present is less that 0,02 %, the analysis may be reported at
“< 0,02 %”.
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ISO 4996:2007(E)
Table 1 — Chemical composition (heat analysis), %
Method of C Mn Si P S
a
Grade Class
b
deoxidation max. max. max. max. max.
C NE 0,20 1,60 0,50 0,040 0,040
HS355
D CS 0,20 1,60 0,50 0,035 0,035
C NE 0,20 1,60 0,50 0,040 0,040
HS390
D CS 0,20 1,60 0,50 0,035 0,035
C NE 0,20 1,70 0,50 0,040 0,040
HS420
D CS 0,20 1,70 0,50 0,035 0,035
C NE 0,20 1,70 0,50 0,040 0,040
HS460
D CS 0,20 1,70 0,50 0,035 0,035
C NE 0,20 1,70 0,50 0,040 0,040
HS490
D CS 0,20 1,70 0,50 0,035 0,035
The nitrogen content is controlled: normally it should not exceed 0,009 % for NE steel or 0,015 % for CS steel.
Each grade contains one or more microalloying elements with the following restrictions: Ti – 0,10 % max.,
Nb – 0,08 % max., V – 0,10 % max. The amounts of these elements are subject to agreement between the
manufacturer and purchaser. In the absence of an agreement, the amounts shall be at the discretion of the
manufacturer. In all cases, the sum of Ti, Nb, and V shall be less than or equal to 0,22 %. In no case shall Nb, V or Ti be
less than 0,005 %.
a
Class C steels are to be used in cases where, owing to the conditions and th
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